TY - JOUR
T1 - Lithium-Rich O2-Type Li0.66[Li0.22Ru0.78]O2Positive Electrode Material
AU - Umeno, Hirohito
AU - Kawai, Kosuke
AU - Nishimura, Shin Ichi
AU - Asakura, Daisuke
AU - Okubo, Masashi
AU - Yamada, Atsuo
N1 - Funding Information:
This work was financially supported by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan; Grant-in-Aid for Scientific Research (S) No. 20H05673. M.O. was financially supported by Grant-in-Aid for Scientific Research (A) No. 21H04697 and Grant-in-Aid for Scientific Research on Innovative Areas 19H05816. K. K. was financially supported by Grant-in-Aid for JSPS Fellows No. 20J14291. X-ray absorption/emission spectroscopy at BL07LSU of SPring-8 was performed by joint research in SRRO and ISSP, the University of Tokyo (Proposal No. 2021A7498 and 2020A7474). The synchrotron X-ray diffraction experiments were conducted at a beamline 5S2 of Aichi Synchrotron Radiation Center, Japan (Proposal No. 2020D4002). The authors are grateful to J. Miyawaki and Y. Harada at the University of Tokyo for their support on the X-ray absorption/emission experiments.
Publisher Copyright:
© 2022 Electrochemical Society Inc.. All rights reserved.
PY - 2022/4/1
Y1 - 2022/4/1
N2 - Increasing the energy density of lithium-ion batteries is an important step towards flexible electricity supply, which can be achieved by developing large-capacity positive electrodes. Lithium-rich oxides have been a longstanding research target because of their large capacity involving extra oxygen-redox reactions. In this work, we report the synthesis, electrochemical properties, electronic structure, and structural evolution of O2-type lithium-rich layered oxide Li1.22-xRu0.78O2. A robust Ru-O layered framework without Ru migration allows for unveiling the solid-state electrochemistry of O2-type lithium-rich layered oxides with possibility of a large yet stable extra capacity for oxygen-redox reaction. Using a combination of X-ray photoelectron spectroscopy, X-ray absorption/emission spectroscopy, and in situ/ex situ X-ray diffraction, we clarified that O2-Li1.22-xRu0.78O2 delivers a large capacity of 200 mAh g-1 in association with Ru5+/Ru4+ and Ru4+/Ru3+ two-electron redox reactions under a solid-solution process, but with no contribution from the extra oxygen-redox reaction.
AB - Increasing the energy density of lithium-ion batteries is an important step towards flexible electricity supply, which can be achieved by developing large-capacity positive electrodes. Lithium-rich oxides have been a longstanding research target because of their large capacity involving extra oxygen-redox reactions. In this work, we report the synthesis, electrochemical properties, electronic structure, and structural evolution of O2-type lithium-rich layered oxide Li1.22-xRu0.78O2. A robust Ru-O layered framework without Ru migration allows for unveiling the solid-state electrochemistry of O2-type lithium-rich layered oxides with possibility of a large yet stable extra capacity for oxygen-redox reaction. Using a combination of X-ray photoelectron spectroscopy, X-ray absorption/emission spectroscopy, and in situ/ex situ X-ray diffraction, we clarified that O2-Li1.22-xRu0.78O2 delivers a large capacity of 200 mAh g-1 in association with Ru5+/Ru4+ and Ru4+/Ru3+ two-electron redox reactions under a solid-solution process, but with no contribution from the extra oxygen-redox reaction.
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U2 - 10.1149/1945-7111/ac6459
DO - 10.1149/1945-7111/ac6459
M3 - Article
AN - SCOPUS:85129778188
SN - 0013-4651
VL - 169
JO - Journal of the Electrochemical Society
JF - Journal of the Electrochemical Society
IS - 4
M1 - 040536
ER -
